﻿<p><em>IfcDerivedUnitEnum</em> is an enumeration type for allowed types of derived units.</p>

<blockquote class="history">
HISTORY&nbsp; New type in IFC2.0.
</blockquote>

<blockquote class="change-ifc2x4">
IFC 2x4 change: added AREADENSITYUNIT, SOUNDPOWERLEVELUNIT, SOUNDPRESSURELEVELUNIT and TEMPERATURERATEOFCHANGEUNIT.
</blockquote> 